Pulp-cleaning apparatus



H. w. SOUTHWORTH.

PULP CLEANING APPARATUS. APPLICATION man JAN. 19. 1920.

1,402,456. Patented Jan. 3, 1922 Fig.- 3

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,HORATIO W. SbUTI-IWORTI-I, OF BROOKLYN, NEW YORK. V

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' and the State of New York, have invented certain new and useful Improvements in Pulp-Cleaning Apparatus, of which the following is a full, clear, and exact specifica- 'tlOIl.

This invention relates to hollanders or other machinery for cleaning paper stock which is charged with ink, and my invention consists mainly in applying pressure rolls to the stock as an intermediate step in its ink and dirt removing process, by means of which the ink and dirt charged stock is pressed nearly dry and is then permitted to absorb a quantity of clean water-prior to its second treatment by the customary revolving knives and bed plate such as are employed in hollanders.

In the drawings forming part of this specification, Fig. 1 is a plan view of a hollander having my improvements applied thereto. Fig. 2 is a side sectional elevation of the same. Fig. 3 is a sectional end view thereof. Fig. i is a detail view of the pressure rolls showing means for giving a resilient pressure thereto.

In hollanders as customarily constructed, an oblong tub 1 is provided with a main shaft 2 having a driving pulley 3, a set of revolving knives 4 turned by said shaft, a bed plate 5 co-acting therewith, and two drum washers 6, the latter being separated from the revolving knives and bed plate by a mid feather 7.

I dispense with one drum washer and in gears 14 cause the cylinders to revolve in unison, power being connected to the lower cylinder through a sprocket wheel 15 and chain 16 from an electric motor 17, or other source.

Upon the upper cylinder 11 rests the edge of a board or doctor 19, and leading up to Specification of Letters Patent. 7 Application iled. January 19, 1920. Seria1'No.'352,610.

the juncture of the two cylinders is an inclined plane 20 up which the pulp can be guided to the cylinders. This plane is hinged, as at 23,-so that it can if desired be turned up away from the floor to permit the passage of the pulp beneath the cylinders. Ordinarily, however, the plane 20 is used, and'in addition a block or board 21 may be secured beneath the roll 10 to make sure no pulp can pass except between the cylinders.

The operation of the apparatus is as follows: The dirt bearing or inky pulp and water having first been treated by the revolving knives a in conjunction with the plate 5, the same passes to the plane 20 and follows up its surface to the rolls 10, 11 through which it is forced, forcing the ink and dirt bearing water back from the mass toward the drum washer 6 by which it is removed from the tub. The stock then meets a stream of fresh water from the supply valve 22 and is carried again to theknives l and bed plate 5. The contact of the latter with the stock is now so light that only a separation of the fiber-mass is effected, so that no injury is caused to the fibers.

In well known means for ink-extraction,

reliance is placed upon the contact of the re-.

volving knives with the bed-plate, but such contact necessitates the cutting or grinding of the paperstock so finely that the fiber is badly weakened, and much stock is lost by the fine comminution. By my process and apparatus, on the other hand, the ink-laden water is forced from the stock by the pressure of the smooth cylindrical surfaces of the rolls 10, 11, which are wholly incapable of injuring the fibers. The ink-laden water being immediately removed from the tub, fresh water added to the pulp, and the knife action repeated, a cleanliness is obtained for the paper stock which is impossible to former processes. At the same time, far less of the stock is rendered incapable of further use and hence less is waste That I claim is:

1. In apparatus for cleaning paper stock from ink and other impurities, the combination with a receptacle, of beating rolls, a pair of compression rolls maintained in resilient engagement one above the other, and means fortheir forcible rotation and for the deliv ery thereto of the paper stock after its treatment by said beating rolls.

2. In apparatus for cleaning paper stock Patented. J an. 3, 1922.

a pair of compression rolls located Within the water, means for forcibly rotating the latter rolls, and means for preventing the paper stock in the water from passing the compression rolls except as forced through between them. 7

4. In apparatus for cleaning paper stock from ink and other impurities, the combination with a water receptacle, of beating rolls, a pair of compression rolls located one above theother with'their junction line below the level of the water resilient means pressing the latter rolls together, means for their actuation, a doctor engaging the upper roll of said pair, and a'pivoted inclined plane between the fioor of the receptacle and'the lower roll of said pair.

In testimony that I claim the foregoing invention, I have hereunto set myhandthis twelfth day of January, 1920.

HORATIO W. SOUTHVVURTH. 

